Lyons Township High School's North Campus

Police cars sit parked outside Lyons Township High School's North Campus after the school was evacuated after what police say were apparently unfounded reports of gunshots.

Police cars sit parked outside Lyons Township High School's North Campus after the school was evacuated after what police say were apparently unfounded reports of gunshots. (Wes Venteicher, Chicago Tribune)

Police cars sit parked outside Lyons Township High School's North Campus after the school was evacuated after what police say were apparently unfounded reports of gunshots.